Duplicating machine



July 15,1941. WQA. new 2,249,313 Y nurmcnme MACHINE v Filed June 30, 1939 4 Sheets-Sheet '1 INVENTOR. t lJ/diaf 67/12 ruff,

ATTORNEY.

July 15, 1941.

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July 15,1941. w. A. KRQPP DUPLICATING MACHINE 4 Sheets-Sheet 4 Filed June 30, 1939 INVENTOR. lULZZzis 63.12 rgp a ATTORNEY.

Patented July 15, 1941 DUPLICATING MACHINE Willis A. Krupp,

Adding Machine Comp poration of Illinois Chicago, Ill., assignor to Victor any, Chicago, III., a cor- Application June 30, 1939, Serial No. 282,015

11 Claims.

This invention relates to improvements in duplicating machines of the type provided with rotary drums on which are secured gelatin bands or the like to receive impressions to be transferred to copy sheets.

One of the objects of the present invention is to provide in such machines a simplified mechanism for facilitating the feeding and stripping of the copy sheets.

Another object of the invention is to provide improvements in the construction of the drum and the mechanism for attaching the gelatin band or other band thereto.

Further objects will be mentioned or will become apparent from a perusal of the specification herein.

The drawings illustrate a preferred embodiment of the invention which is herewith described for the purpose of explaining the nature of the invention and the manner of its use, without, however, intending that the invention should be considered as limited to the details of construction herein disclosed.

In the drawings,

Fig. 1 is a side elevation of a machine made in accordance with my invention.

Fig. 2 is a rear elevation of the machine looking into the arcuate opening in the drum.

Fig. 3 is a sectional View taken on the line 33 of Fig. 2.

Fig. 4 is a sectional 4-4'0f Fig. 2.

Fig. 5 is a partial sectional view showing a copy sheet about to be stripped from the drum.

Fig. 6 is a partial sectional view illustrating the manner in which a duplicating band may be secured to the drum.

Referring now to the drawings, mounted on the base I of the machine are side plates 2 and 3 which are rigidly connected together by tie rods 4, 5 and 6. These plates may be secured to the base in any appropriate manner.

Rotatably journaled in the side plat-es is a shaft I on which is keyed or otherwise suitably secured a gear 8 which drives one of the stripping rolls. Supported on the shaft is the drum 9, a cylindrical member having a longitudinally extending arcuate gap defined by the inwardly bent flanges I and l I formed on the drum. The drum is provided with end walls I2 and I3, either or both of which may be secured to the shaft, the end wall I3 being secured by means of screws I4 and I to a cam I6, the latter being rotatably supported upon a hub'on the shaft 1. Cam I6 is provided with slots I1 and I8 which thereby view taken on the line i be appropriate if an makeit possible to secure the cam to the drum selectively in various angular positions relatively to the drum for a purpose which will later be described. .The recess I9 in the cam acts as a detent into which the cam follower 20 may recede to facilitate stopping the drum at the sheet feeding position. The cam follower is mounted on an arm 2| pivotally supported on the rod 5 and is held against the cam by spring 22 (see Fig. 3).

The detent in the cam and the cam follower are so designed and the follower is such that the drum may be rotated continuously by the handle 23 if desired, as might automatic sheet feeding mechanism were added to this machine. However, when manual feeding is employed, the detent and follower aid in stopping the drum accurately at the sheet feeding position.

As shown in Fig. 6, the duplicating band 24 is provided at its ends with clips 25 and 26 which are clamped to the ends of the band in any appropriate manner. The hook on clip 25 may be a continuous channel member notched at its middle portion to embrace the bracket 21 secured to the underside of the flange I0, whereby that end of the band may be accurately centered. The clip 25 is engaged withthe edge of the flange Ill while the drum opening is in a convenient position, after which the drum is rotated to the position shown in Fig. 6, whereupon the hook member 26 will then be engaged over the edge 28 of a tensioning device pivoted on the shaft 29 carried by the drum ends.

This device includes the plate 30 rotatably mounted on the rod 29, which is supported on the drum ends. Secured to its outer edge is a handle 3| which may be grasped by the operator to rotate the device to the position shown in Fig. 6. At the opposite ends of the plate 30 are side flanges 32 and 33 to each of which is secured a spring such as St (the other spring not being shown), each spring being anchored to the inner surface of an end wall of the drum as shown in Fig. 6. When the hook 25 has been engaged over the edge 28, the

tensioning device may then be allowed .to rotate 7 :back into the drum to the position shown in Fig.

5 thereby adequately tensioning the band over the drum. The projection 35 (see Fig.2) provided on' the edge 28 of the plate 30 facilitates the centering of the associated end of the gelatin band in the same manner. that the bracket 21 aids in centering the opposite end of the gelatin pad.

It should be noted that when the plate 30 rotates into the drum the gelatin band is snubbed around the pivotal axis of the plate and yet respring tension of the cam hence if the band the excess length device and held As determined by the adjustment of cam iii and the action of detent l9 and follower 29 the pressure roller 4! will be resting on top of the margin bar 39, when the drum is stopped at sheet feeding position. Preferably, be contacting the margin bar 39 at the trailing edge thereof, and into the a copy sheet 4i? may be inserted until its leading edge contacts the bar 39. The trailing edge portion 42 of the deflector 35 comprises a smooth plate which terminates closely adjacent the gelatin pad where the latter is bent around the shoulder of the flange l9. 1 The outer surface of the deflector plate forms, when positioned as in Fig. 4, substantially a continuation of the peripheral surface of the gelatin band.

As illustrated in Fig. the trailing edge of the deflector will be rotated outwardly whenever it is free from the pressure roller 4|. Thus the overhanging edge of a copy sheet may be deflected outwardly and as the drum rotates the sheet toward the stripping position the leading edge of the copy sheet will strike the stripping plate 43 and be deflected into rollers 44 and 45. Roller of soft rubber, while roller roller having a knurled or surface.

To provide for the outward rotation of the paper deflector I attach a spring 46 to an arm 41 44 is preferably formed 45 is preferably a steel otherwise roughened depending from the middle portion of the dEfiQC.

tor, anchoring the spring on the bracket 21. In the position of the apparatus shown in Fig. 5, an arm 48 depending from the left end of thedeflector rests against a rubber bumper or stop member 48' which is afflxed to a plate 49 pivotally supported on rod 38. This plate is normally urged to rotate in a counterclockwise direction, as Fig. 5 is-viewed, by the spring 50 anchored to the adjoining end wall of the drum at 5|, the extent of rotation of the plate 49 beinglimited by the eccentrically pivoted stop member 52, which is mounted on the inner surface of the adjoining drum end wall. The stop member may be rotatably adjusted by means of the screw on which it is mounted.

Fig. 6 shows the position to which the deflector plate 42 may be rotated manually to provide clearance for the insertion or removal of the end clip of the gelatin band. The operator merely needs to push the leg 48 with sufiicient force against the bumper 48 to thereby rotate plate 49 about its axis 38 against the action of spring 50.

The deflector plate 42 when pressed inwardly the roller 4! will then space under the roller the grip of the stripping by the pressure roller will not contact the gelatin band but will be stopped closelyadjacent thereto when the arm 41 depending from the right end of the deflector bumps against the eccentric stop member 52, which may be rotatably adjusted by means of its mounting screw to regulate the extent to which the deflector plate may be rotated inwardly.

The pressure roller 4! is journalled in a pairvof arms 54 and 55, which are pivotally mounted on the ends of rod 4. Springs 56 and 51 hold the pressure roller against the gelatin band with sufficient force to press the copy sheets against the band with the desired pressure.

The stripping roller 44 is provided at one end of its shaft with a gear 58, constantly in mesh with the gear 8. The other stripping roller 45 is journaled in a pair of swingable arms 59 and 80, this roller being held resiliently against the driven stripping roller by springs connected to the outer end of the arms 59 and 60, one of these springs being shown at 6 I. Each spring is capable of being adjusted by means of a screw such as 62,

which may be threaded through a bolt, post or other suitable device, such as 63 supported on the side plates.

The paper delivered by the stripping rollers is discharged underneath the feed table 64 on to the top of a delivery chute 65.

The device is operated as follows: After the gelatin band has been placed on the drum in the manner above described and an imprint from a master copy has been transferred to the surface of the gelatin band, a stack of copy sheets will be placed on the feed table 64. The drum will be rotated until the follower 20 drops into the detent [9, thus making it easy for the operator to stop the drum at the feeding position indicated in Fig. 3. The top sheet from the stack will then be fed underneath a guide plate 66 until the leading edge of the sheet contacts the margin bar 39. The smooth surface of the deflector plate makes it easy for the operator to advance the copy sheet underneath the pressure roller until it touches the margin bar. While the operator still is holding the copy sheet snugly against the margin bar he will then start the rotation of the drum, whereupon the pressure roller will roll off the margin bar and clamp the copy sheet against the deflector plate and begin to feed it forwardly. As the drum rotates further the roller will press the copy sheet against the gelatin band thereby causing the impression to be transferred to the copy sheet, and at the same time continuing to feed the sheet from the table.

As soon as the deflector plate has passed beyond the pressure roller it will be swung outwardly by its spring 46 to the extent permitted by bumper 48 thus deflecting outwardly the overlapping leading edge of the copy sheet. As the leading edge of the copy sheet approaches the stripping position as shown in Fig. 5, it will strike the stripping plate 43 and thence pass into the grip of the continuously rotating stripping rollers. A guide plate 61 is provided to guide the leading edge of the copy sheet toward the rollers.

The rotation of the drum will be continued until it occupies the feeding position shown in Fig. 4, whereupon it will be stopped. A new copy sheet may then be fed against the margin bar and as the rotation of the drum is resumed a new sheet is fed on to the gelatin band while its predecessor is still being stripped therefrom.

It will now be appreciated that when the copy sheets are fed as indicated, all sheets will register with the imprint on the gelatin band in a uniform manner. When the drum is stopped at sheet feeding position the deflector plate is so positioned relatively to the feed table that the sheet can not strike the sticky gelatin band but will strike the smooth surface of the deflector plate and readily slide up into contact with the margin bar. Thereafter, when rotation of the drum is resumed, the sheet will be clamped by the factory registration of the copy sheets with the imprint on the gelatin band, although the added convenience of the margin bar is preferable.

The combination of means for attaching the gelatin band to the drum and the construction of my deflector plate yields several advantages not found heretofore in machines of this class. Both ends of the gelatin'band are folded into the interior of the drum andsecured therein, hence the fastening means for the gelatin band leaves no protuberances extending beyond the periphery of the drum to interfere with the pressure roller and the smooth rotation of the machine. Having the gelatin band ends turned into the drum interior I am able to mount the pivoted deflector plate within the arcuate gap of the drum with the trailing edge of this plate closely adjoining but not in contact with the gelatin band. Copy made on the master sheet may be positioned close enough to the top edge of the sheet so that the first line of the copy which is off set onto the gelatin band may lie very close to the line where the gelatin band is folded inwardly. Consequently, a narrow margin at the top of the copy sheets is thus made possible. Should it be desired to narrow down this margin the cam It may be so adjusted as to bring the line of tangential contact of the pressure roller with the deflector plate even closer to the leading edge of the gelatin band, that is, if the bar 39 is omitted from the deflector. Of course, the margin bar itself may be mounted closer to the trailing edge of the deflector plate than is shown in the accompanying drawings. Furthermore, by mounting the deflector plate within the arcuate gap in the drum at a position where it is not interfered with by the gelatin band I am able to place the deflector plate so that it forms practically a continuation of the peripheral surface of the gelatin band.

It will be obvious that the machine is so designed that if it be reversely rotated inadvertently no harm will result.

Whereas the duplicating band is referred to herein as a gelatin band it will be perceived that I may employ duplicating bands of generally similar characteristics yet not containing gelatin.

The pressure or platen roller 4! is preferably made of some suitable resilient material such as rubber and will usually be quite soft to facilitate the uniform pressing of the copy sheets against the duplicating band and to aid in the initial feeding of the copy sheets while they are gripped between this roller and the deflector plate 42.

It should be understood that the invention is not limited to the details of construction shown and described herein as it is subject to considerable variation and modification, all of which is intended to be claimed in the appended claims.

Having shown and described my invention I claim:

1. In a duplicating machine, a rotary drum having an arcuate gap, a member pivotally mounted within said drum for rotation with said form substantially a continuation of the drum surface, a portion of said member serving as a margin stop for copy sheets and another portion serving as a deflector for'copy sheets about to be stripped from the drum.

2. In a duplicating machine having a rotary drum with an arcuate gap therein, one margin of said gap being defined by an inwardly bent flange on said drum over which a duplicating band is disposed, a member pivotally mounted in said gap for rotation with the drum having a portion closely adjoining the band overlying saidflange and having another portion somewhat removed therefrom constructed to serve as a margin stop for copy sheets.

3. In a duplicating machine having a drum with an arcuate gap therein, one margin of said gap being defined by an inwardly bent flangeon said drum over which a duplicating band is dis posed, a member pivotally mounted in saidgap for rotation with the drum having a portion closely adjoining the band overlying said i flange and having another portion somewhat removed therefrom constructed to serve as a margin stop a for copy sheets, the first mentioned portion of said member acting as a copy sheet "deflector, after i the sheet has been contacted with the duplicating band.

'4. In a duplicating machine, a rotary drum having an arcuate gap in its peripheral surface,

one margin of said gap being defined by an in-' wardly bent flange of the drum, a duplicating band disposed on the periphery of the drum and overlying said flange, a copy sheet deflector pivotally mounted on said drum within said gap with an edge portion thereof closely adjoining that portion of the band overlying said flange, said member being rotatable to one position for deflecting the copy sheets and further rotatable to another position to facilitate attachment to or removal of the band from said flange. I

5. In a duplicating machine, a rotary drum having an arcuate gap in its peripheral surface,

one margin of said gap being defined by an in wardly bent flange of the drum, a duplicating band disposed on the periphery of the drum and overlying said flange, a copy sheet deflector pivotdrum having a surface shaped and positioned to ally mounted on said drum within said gap with an edge portion thereof closely adjoining that portion of the band overlying said flange, said member being rotatable to one position for defleeting the copy sheets and further rotatable to another position to facilitate attachment to or removal of the band from said flange, and resilient means for controlling both said movements of said member.

6. In a duplicating machine, a rotary drum having a cylindrical portion interrupted by an arcuate gap, a gelatin band disposed over said portion with its ends bent inwardly at the margins of said gap, a pressure roller adjoining said drum, and a member pivotally carried by said drum within said gap adapted when lying in the periphery of the drum for cooperating with said roller providing a margin stop against which copy sheets may be fed, and means for rotating said member when free of the roller for deflecting outwardly the leading edge of a copy sheet extending over said gap.

7. In a duplicating'machine, a rotary drum having a cylindrical portion interrupted by an arcuate gap, a gelatin band disposed over said portion with its ends bent inwardly at the margins of said gap, 2. pressure roller adjoining said drum and means pivotally carried by said drum within said gap cooperating with said roller providing a margin stopagainst which copy sheets may be fed, said means including a frictionless surface lying between the adjoining gelatin band and said stop.

8. In a duplicating machine, a rotary drum, a duplicating band secured on said drum with its leading edge bent inwardly and secured within the drum, a platen roller, and means positioned on the drum in advance of the bend in said band cooperating with said roller for gripping and initially feeding copy sheets prior to their contact with said band, said means being movable to facilitate the securing or withdrawal of the leading edge of said band.

9. In a duplicating machine, a rotary drum having a cylindrical wall lying in the periphery of the drum a distance less than the entire periphery of the drum, a duplicating band disposed on said wall with its ends terminating beyond the margins of said wall and within the drum, a member adjoining one margin of said cylindrical wall beyond the duplicating band having an area extending a substantial distance in the peripheral surface of the drum, and a pressure roller cooperating with said member to grip and advance copy sheets prior to their contact with the duplicating band, said member being movable away from the margin of said wall to permit insertion and removal of the duplicating band.

10. In a duplicating machine, a cylindrical drum having an arcuate gap in its periphery, a pressure roller, a duplicating band mounted on said drum with its ends extending into said gap, deflecting means positioned adjoining one margin of said gap extending a substantial distance in the periphery of said drum for cooperating with the pressure roller for gripping and advancing copy sheets prior to contact with the band, said means being pivotally mounted for deflecting the paper during a stripping operation and movable to permit insertion and removal of the band.

11. In a duplicating machine, a rotary drum having an arcuate gap, a pressure roller, a duplicating band covering said drum between the margins of said gap, a plate member pivotally mounted in said gap having an edge portion closely adjoining but supported out of contact with the band at one edge of said gap and having a substantial area co-extensive with the drum periphery for supporting the leading edge of copy sheets when pressed thereagainst by the pressure roller, and a margin stop on said member, the edge portion of said member being adapted to swing outwardly when free of the roller to deflect the copy sheets outwardly to facilitate stripping.

WILLIS A. KROPP. 

